UnityWebgl平台与JS交互、使用UnityWebRequest对接

Unity与前端js交互

在UnityWebgl平台上，经常会从前端获取参数，如token、host等，使用jslib与前端js代码进行交互。只需要在Plugins文件夹中创建一个xxx.jslib文件即可。
jslib文件代码如下：

mergeInto(LibraryManager.library, {
	getUrlParams: function (defaultValue) {
		var name = Pointer_stringify(defaultValue);
  		var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)"); //构造一个含有目标参数的正则表达式对象
  		var r = window.location.search.substr(1).match(reg);  //匹配目标参数
  		if (r != null){
			var returnStr = unescape(r[2]);
			var bufferSize = lengthBytesUTF8( returnStr) + 1;
			var buffer = _malloc(bufferSize);
			stringToUTF8(returnStr, buffer, bufferSize);
			 return buffer;
		} 
		else return null; //返回参数值
	},
 });

想要在Unity中调用jslib中的getUrlParams方法，只需要在Unity中合适的地方添加以下代码后调用即可:

    [DllImport("__Internal")]
    private static extern string getUrlParams(string name);

注意：
在Unity中向js传递字符串时需要在js中使用Pointer_stringify(str)进行转换。
在js中向Unity返回字符串的时候也需要进行如下操作：
var bufferSize = lengthBytesUTF8( returnStr) + 1;
var buffer = _malloc(bufferSize);
stringToUTF8(returnStr, buffer, bufferSize);
return buffer;

web数据请求

这里封装了一下UnityWebRequest，只需要提供对应的参数和回调即可进行数据请求，包括可选择对数据进行Base64加密。

public enum UnityWebRequestType
{
    POST,
    GET
}

    /// 

    /// 发送HTTP数据
    /// 
    /// 请求类型
    /// 请求地址
    /// 传输的数据
    /// 发送数据是否需要Base64加密
    /// 获取数据是否需要Base64加密
    /// 失败回调
    /// 成功回调
    /// 额外添加的头名称
    /// 额外添加的头值
    public void SendHttpMessage(UnityWebRequestType type, string url, string jsonData, bool sendBase64, bool getBase64, UnityAction failureCallBack, UnityAction<string> successCallBack, string[] otherHeaderName, string[] otherHeaderValue)
    {
        StartCoroutine(WebRequest(type, url, jsonData, sendBase64, getBase64, failureCallBack, successCallBack, otherHeaderName, otherHeaderValue));
    }

    private IEnumerator WebRequest(UnityWebRequestType type, string url, string jsonData, bool sendBase64, bool getBase64, UnityAction failureCallBack, UnityAction<string> successCallBack, string[] otherHeaderName, string[] otherHeaderValue)
    {
        Debug.Log(type.ToString() + "\t" + url + "\t" + jsonData);
        if (sendBase64)
        {
            jsonData = Convert.ToBase64String(Encoding.UTF8.GetBytes(jsonData));
        }
        byte[] body = Encoding.UTF8.GetBytes(jsonData);


        UnityWebRequest unityWeb = new UnityWebRequest(@url, type.ToString());
        unityWeb.uploadHandler = new UploadHandlerRaw(body);
        unityWeb.SetRequestHeader("Content-Type", "application/json;charset=utf-8");
        //unityWeb.SetRequestHeader("Authorization", "Bearer " + token);
        if (otherHeaderName != null)
        {
            for (int i = 0; i < otherHeaderName.Length; i++)
            {
                unityWeb.SetRequestHeader(otherHeaderName[i], otherHeaderValue[i]);
            }
        }
        
        unityWeb.downloadHandler = new DownloadHandlerBuffer();
        yield return unityWeb.SendWebRequest();

        if (unityWeb.isNetworkError || unityWeb.isHttpError)
        {
            Debug.LogError("UnityWebRequest 请求失败:" + unityWeb.error);
            failureCallBack?.Invoke();
            yield break;
        }

        if (unityWeb.isDone)
        {
            string result = unityWeb.downloadHandler.text;
            if (getBase64)
            {
                byte[] c = Convert.FromBase64String(result);
                result = Encoding.UTF8.GetString(c);
            }          
            Debug.Log("UnityWebRequest 请求成功:" + result);
            successCallBack?.Invoke(result);
        }
    }

    /// 

    /// 发送表单数据
    /// 
    /// 请求地址
    /// 表单Key数据
    /// 表单Value数据
    /// 发送数据是否需要Base64加密
    /// 获取数据是否需要Base64加密
    /// 失败回调
    /// 成功回调
    public void SendHttpMessageByForm(string url, string[] fromKey, string[] fromValue, bool sendBase64, bool getBase64, UnityAction failureCallBack, UnityAction<string> successCallBack)
    {
        StartCoroutine(WebRequestFrom( url, fromKey, fromValue, sendBase64, getBase64, failureCallBack, successCallBack  ));
    }

    private IEnumerator WebRequestFrom( string url,string[] fromKey, string[] fromValue ,bool sendBase64, bool getBase64, UnityAction failureCallBack, UnityAction<string> successCallBack)
    {
        WWWForm form = new WWWForm();
        if (fromKey != null)
        {
            for (int i = 0; i < fromKey.Length; i++)
            {
                if (sendBase64)
                {
                    fromValue[i] = Convert.ToBase64String(Encoding.UTF8.GetBytes(fromValue[i]));
                }
                Debug.Log("表单添加字段：" + fromKey[i] + "\t" + fromValue[i]);
                form.AddField(fromKey[i], fromValue[i]);
            }
        }
        UnityWebRequest unityWeb = UnityWebRequest.Post(@url, form);

        unityWeb.downloadHandler = new DownloadHandlerBuffer();
        yield return unityWeb.SendWebRequest();

        if (unityWeb.isNetworkError || unityWeb.isHttpError)
        {
            Debug.LogError("UnityWebRequest 请求失败:" + unityWeb.error);
            failureCallBack?.Invoke();
            yield break;
        }

        if (unityWeb.isDone)
        {
            string result = unityWeb.downloadHandler.text;
            if (getBase64)
            {
                byte[] c = Convert.FromBase64String(result);
                result = Encoding.UTF8.GetString(c);
            }
            Debug.Log("UnityWebRequest 请求成功:" + result);
            successCallBack?.Invoke(result);
        }
    }